Method of mold-making.



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APPLICAHOA HLM) QCTV 1l. i915,

Patented May 16, 1916.

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/ JDHN WILMER PEMBERTON, F LINCOLN, CALIFORNIA.

METHOD oF mom-MAKING.

Application filed October 11, 1915. Serial No. 55,276.

To all wlmi/t if may concern.' Be it known that l, J-onx VVILMER PEM- niinToN,-a citizen of the United States, and a resident of Lincoln, county of Placer, and State of aljlfornia, have invented an .1m-

provenient in Methods of Mold-Making; and l do hereby declare the following to be a full, clear, ani' act description of my invention. sin/:h ae will enable others skilled in the artto which it appertains to make, and use the saine.

This invention relates to the method of making, from any, substance adapted to setf such pltster of4 Paris,rnolds to be use'd in molding into any givcnforin clay,

terra-cotta, or other plastic material. The objects of my invention are to facilitate the mnstruction of the molds; to

improve the ;to reduce the cost thereof;

j@ and to increase the period of their useful- T he molds referred to herein are technirally known is. safe-molds, as distinguished from waste-molds, :11. e., molds ,made in a number of vpieces so arranged to be capable of lbeing withdrawn from the molded strut-tare and of' being pat together again for a repetition of the lmolding process.

Prior to my invention, it has been -necessary in the terracotta,cementblock, and other similar' industries, rot to make a con'iplete ni-'idel conforming 1n all respectsto the shape and dimensions of the block or .'3'5 structure desired; a iuold in plaster of Paris` was then iliade around, .auch model. In my method ot' making a mold, it is no longer neven-sary to make such a model. and, by in; elimination l eli'ect a 4o labor. and materials.

Mv method ol inold-n1al ing consists of a Series ot' operations, duringthe variou'e stages of which the faQ/lthe mold are produced. ln order that nl v invention may be mide Stood and readily carried into the same .is described with reference cli" to the actoinpan ving;r drawings, in which Similar numbers indicate like )artS 5o Figure l is a top view of lic adyusitable frame. Fig. is a top vicivof face with bara for sides laid thereon. Fig. 3 is a top view of faire with stopn for ends laid thereon and theA cast sides in place. Fig. 4 is a cross section on the line AA of Fig.

Specification of Letters Patent.

gain in time,l

sides, and ends of' Patented May 1o, 1916.v

1, after the frame is filled with plaster of Paris. Fig. .3 is a cross section on the line B-B of Fig. 2, after sides are cast. Fig.`

(i is a cross section on the line Q -C of Fig'. 3. Fig. 7 is an elevation of the separa-v 60 ble end. Fig. 8 is a detailed view in per- I spective of Fig. 7, the locking device oinit ted. Figs. 9, l() and 1] are an elevation, section, and top view, respectively, of the left hand siuipleinciital har.l Figs. 12,13, 55 and 1l are anl elevation, Section,l und top View, respectively, ot' the right hand supplemental bar. l

The face of my mold is made as t'olloivs` An adjustable frame consisting of tour anguiar strips, 2, isplaccd on a bench or tablel top, 3, in the forni of the piece to be made,

usually a square or rectangle, one end f each of said strips touching the side 0f one of the other stripnwat right angles. The inner edges of tho horizontal portion, 4, of the angular strips'are beveled,V as at Phe said horizontal portions oi'- ea-id strips are provided with lugs, o, placed thereon at intervals. One end of three of the Said strips is suitably cut away or notched, as at 7, so that the vertical portions, 8, thereof, niav Contact with'eachother, overlap the horizontal .po1-tions,'l, and l'orin a. tight joint. To 'facilitate the disjoinder and withdrawal 85 ofthe frame after use, one ol" said Strips is .provided with the separable end, 9, likewise. notched, as at 7,'to forni a tightl joint. The separable end is held securely in position by the latches, 10. A suitably mounted locking-device with thumb-screws, ll,is provided tolock the trame.. Having locked the adjustable strips, I then lill the receptacle vformed hy the placing of this `frame ont-he table-top, (the. tabletop acting as a base) with plaster of Paris, or `similar substance,

` ofthe Said Strips forms a chainfer, 12; and

that portion ot' the cast which contacted 10' with the horizontall'iportion, 4, of the said stripsv forms a rim, 13, said rim being' indented at intervalr` by reason of contact with the ings, 6, on said strips. Said Chamfer and said riin constitute a seat for the here- 11( -inafter described sides and ends of my mold.

This completes my first operation in making my mold. A

The sides of my mold are made as follows: On top of the face and along the, edges of the long side thereof, presuming the face to be rectangular in formLI then place bars, 14, of suitable shape and of sufficient length.. to project beyond each end ot' the facet Two supplementall bars, a lett 15, and a right 1G, areinserted under the bars, 14, to fill the gap between the said bars, 14, and that portion of the face indicated at 17. Plaster of laris is then thrown up by hand against the bars, 14, 15, und 16, the chamter, 121, andthe rim, 13,4 for the retuired distance and permitted'to set -1 tien 4remove the bars, and the plaster of -Pars thus cast constitutes the sides, B, of

my mold. Projections on the bottom of the sides formed in the indentatons of the rim, 13, constitute joggles for the mold when the sides are put up. This completes my second operation.

The ends of my mold are made as follows: On top of the face and along the edges of the short sides thereof presu/ming the said face to be rectangular in form, I then place suitably shaped stops, 18, of such len h that one end of each thereof contacts Wit the inner surface of one ot'the previously cast plaster of Paris sides. ,'lhe other end approaches the inner surface of' the opposit'e plaster of Paris side.

-thestops, 18, the chamfer, 12, and the rim,

13, lfor the required distanceAI and permitted to seh I then remove the said stops. and

' y the plaster of Paris thus cast constitutes the ends, C, of my mold. Projection on the bot- .tom of the ends formed in the indcntations of the rim, A13, constitute joggles for the mold when the ends are put up. -".i`his completes my third operation. l

I thus make a mold copsistlng of a fac, two sides, and two ends which when Vassembled comprises a receptacle, the inner convolutions of which constitute the reverse of the molded structure desired. This mold is capable also of being withdrawn from around the molded structure, and it may be I then filll thel remaining space with clay, 19, thuscontinuthat bars and stops of different t'ernfl and what I desire to claim and secure by Lettcrs Patent, is:

1. The method of making a separable mold comprised of a fat-e. two sides, and two ends` from any substance adapted to set," for plastic material: said method consisting in first castin in an adjustable frame. suitably maintained` a bottom provided with a,"f`ace, then in casting sides for said mold against suitable liars laid on top -of saidface and along two parallel edges thereof, and finally in casting ends for said mold against suitable stops laid on top of said face along the other two parallel edges thereof and between the previously cast sides of the mold. I

2. The method of making a separable mold for plastic material from any substance adapted to sct; said method consisting in first casting in an adjustable frame a face for said mold; then in casting sides for said mold against the outside of suitable templets laid on top of said face and along two parallel edges thereof'. and finally in easting ends for said mold against the outside ot' additional suitable temple-ts laid on top of said face along theI other vtwo parallel edges thereof and between the previously cast sides of' the mold.

3. The method of making a separable mold for plastic material from any substance adapted to set without first making a model otI the molded strugture desired;

said method consisting in first casting in an adjustable frame a face -for said mold, then in casting sides for said mold against the outside of suitable templets luid on top of said face and along two parallel edges thereof, and finally in casting ends for said mold against the outside of additional suitable templets laid 0n top of said face along the other two para lel edges thereof and between the previously cast sides of the mold.

In testimony whereof I have hereunto atiixed my signature in the presence of two subscribing witnesses.

JOHN WILMER PEMBERTO. i y

Witnesses:l

HENRY A. Soimonmm,

Runnin* J. Tarma 

